// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

namespace SixLabors.ImageSharp.Drawing {
  /// <summary>
  /// Describes geometry-wide metadata for a <see cref="LinearGeometry"/> instance.
  /// </summary>
  /// <remarks>
  /// This metadata is computed eagerly during lowering so backends do not need to enumerate the geometry again to
  /// discover basic information such as total segment count or bounds.
  /// </remarks>
  public readonly struct LinearGeometryInfo
  {
      /// <summary>
      /// Gets the bounds of all points stored in the containing <see cref="LinearGeometry"/>.
      /// </summary>
      public required RectangleF Bounds { get; init; }

      /// <summary>
      /// Gets the total number of contours in the containing <see cref="LinearGeometry"/>.
      /// </summary>
      public required int ContourCount { get; init; }

      /// <summary>
      /// Gets the total number of stored points across all contours.
      /// </summary>
      public required int PointCount { get; init; }

      /// <summary>
      /// Gets the total number of derived linear segments across all contours.
      /// </summary>
      public required int SegmentCount { get; init; }

      /// <summary>
      /// Gets the number of derived segments that remain non-horizontal when sampled on pixel boundaries.
      /// </summary>
      /// <remarks>
      /// A segment contributes to this count when its start and end sample into different rows under
      /// pixel-boundary sampling.
      /// </remarks>
      public required int NonHorizontalSegmentCountPixelBoundary { get; init; }

      /// <summary>
      /// Gets the number of derived segments that remain non-horizontal when sampled at pixel centers.
      /// </summary>
      /// <remarks>
      /// A segment contributes to this count when its start and end sample into different rows after the
      /// half-pixel center-sampling offset is applied.
      /// </remarks>
      public required int NonHorizontalSegmentCountPixelCenter { get; init; }
  }
}